Git Gutter is a Sublime Text 2 plugin by JD Isaacks which shows an icon in the gutter area indicating whether a line has been inserted, modified, or deleted.
Here’s a snap of the plugin in action:
Not a Sublime Text user? Don’t sulk away with feature envy just yet. Git Gutter has also been ported to Vim and Emacs.
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Linked by Jerod Santo on Feb 27, 2013